Path-Q Solar

What is the best next step if I am interested in solar but do not know my roof orientation?

Answer

Start by obtaining a reliable roof-orientation and shading estimate rather than guessing from a map or visual impression. You can gather basic information from aerial imagery or a compass, then have a solar provider verify it during a site assessment or proposal.

Key points

  • Orientation is only one input; shading, roof pitch, usable area, and roof condition also affect production.
  • Record the orientation of each roof plane separately if the roof has multiple slopes.
  • A preliminary estimate is useful for screening, but final design should use site-specific measurements.

What it depends on

  • Number and direction of roof planes
  • Nearby trees, buildings, chimneys, and other obstructions
  • Roof pitch and usable area
  • Accuracy of the measurement method

Risks and trade-offs

  • A rough orientation estimate can misstate production if shading or roof geometry is ignored.
  • Waiting for perfect information is unnecessary for requesting preliminary quotes, but a final design should verify the site.

Information you may need

  • Aerial or roof images
  • Approximate compass direction for each roof plane
  • Roof pitch, dimensions, and obstructions
  • Time-of-day and seasonal shading observations

Your next step

What to do next

Mark each roof plane on an aerial image and ask two or more installers to confirm orientation, shading, and usable area in their preliminary designs.

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SQ01097